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    Science. 2006 Jun 23;312(5781):1771-3. Epub 2006 May 18.

    Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303.

    Albert J, Aliu E, Anderhub H, Antoranz P, Armada A, Asensio M, Baixeras C, Barrio JA, Bartelt M, Bartko H, Bastieri D, Bavikadi SR, Bednarek W, Berger K, Bigongiari C, Biland A, Bisesi E, Bock RK, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Ciprini S, Coarasa JA, Commichau S, Contreras JL, Cortina J, Curtef V, Danielyan V, Dazzi F, De Angelis A, de Los Reyes R, De Lotto B, Domingo-Santamaría E, Dorner D, Doro M, Errando M, Fagiolini M, Ferenc D, Fernández E, Firpo R, Flix J, Fonseca MV, Font L, Fuchs M, Galante N, Garczarczyk M, Gaug M, Giller M, Goebel F, Hakobyan D, Hayashida M, Hengstebeck T, Höhne D, Hose J, Hsu CC, Isar PG, Jacon P, Kalekin O, Kosyra R, Kranich D, Laatiaoui M, Laille A, Lenisa T, Liebing P, Lindfors E, Lombardi S, Longo F, López J, López M, Lorenz E, Lucarelli F, Majumdar P, Maneva G, Mannheim K, Mansutti O, Mariotti M, Martínez M, Mase K, Mazin D, Merck C, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Mizobuchi S, Moralejo A, Nilsson K, Oña-Wilhelmi E, Orduña R, Otte N, Oya I, Paneque D, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pavel N, Pegna R, Persic M, Peruzzo L, Piccioli A, Poller M, Pooley G, Prandini E, Raymers A, Rhode W, Ribó M, Rico J, Riegel B, Rissi M, Robert A, Romero GE, Rügamer S, Saggion A, Sánchez A, Sartori P, Scalzotto V, Scapin V, Schmitt R, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sillanpää A, Sobczynska D, Stamerra A, Stark LS, Takalo L, Temnikov P, Tescaro D, Teshima M, Tonello N, Torres A, Torres DF, Turini N, Vankov H, Vitale V, Wagner RM, Wibig T, Wittek W, Zanin R, Zapatero J.

    Source

    Universität Würzburg, D-97074 Würzburg, Germany.

    Abstract

    Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.

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    PMID:
    16709745
    [PubMed]
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